Duodenal ulceration--is endoscopic biopsy necessary?
D000230:Adenocarcinoma / Q000150:complications*; D000368:Aged; D001661:Biliary Tract Neoplasms / Q000150:complications*; D001706:Biopsy; D004381:Duodenal Ulcer / Q000209:etiology* / Q000473:pathology; D006801:Humans; D008297:Male